FreeBSD Man Pages

MICROTIME(9) FreeBSD Kernel Developer's Manual MICROTIME(9)
NAMEbintime, getbintime, microtime, getmicrotime, nanotime, getnanotime --
get the current time
SYNOPSIS#include <sys/time.h>
voidbintime(structbintime*bt);
voidgetbintime(structbintime*bt);
voidmicrotime(structtimeval*tv);
voidgetmicrotime(structtimeval*tv);
voidnanotime(structtimespec*ts);
voidgetnanotime(structtimespec*tsp);
DESCRIPTION
The bintime() and getbintime() functions store the system time as a
structbintime at the addresses specified by bt. The microtime() and
getmicrotime() functions perform the same utility, but record the time as
a structtimeval instead. Similarly the nanotime() and getnanotime()
functions store the time as a structtimespec.
The bintime(), microtime(), and nanotime() functions always query the
timecounter to return the current time as precisely as possible. Whereas
getbintime(), getmicrotime(), and getnanotime() functions are abstrac-
tions which return a less precise, but faster to obtain, time.
The intent of the getbintime(), getmicrotime(), and getnanotime() func-
tions is to enforce the user's preference for timer accuracy versus exe-
cution time.
SEE ALSObinuptime(9), getbinuptime(9), getmicrouptime(9), getnanouptime(9),
microuptime(9), nanouptime(9), tvtohz(9)HISTORY
The bintime functions first appeared in FreeBSD 5.0. The microtime and
nanotime functions first appeared in FreeBSD 3.0 but have existed in
other incarnations since 4.4BSD.
AUTHORS
This manual page was written by Kelly Yancey <kbyanc@posi.net>.
FreeBSD 10.1 September 16, 2004 FreeBSD 10.1